当粒细胞检测到蚊子血液中有外来物体，它们会杀死他或是通知其他细胞完成这一工作。

When granulocytes detect a foreign body in a mosquito's blood, they can either kill it themselves or signal another cell to come do the job.

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但是，在硝酸盐的周围发现包含氢气的氨，很有可能是来自富含水的外来物体- - -冰冷的彗星。

But ammonium, found along with the nitrates, contains hydrogen that most likely came from an incoming object rich in water - like an icy comet.

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戴维斯指出，证明一种生物体不是“我们所知道的生命”的唯一办法就是看它是否是由其他生命形式所没有的外来元素组成的。

Davies suggested that the only way to prove an organism wasn't "life as we know it" was if it were built using exotic elements which no other form of life had.

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